UK - Where to buy Bluetooth 2.0 + Airport Card

I went into the Regent Street store on Friday night to buy a Mac Pro. they couldn't fit the BT+AP module until the next day. I said I'd fit it. They said its not a user serviceable part. But he said I could buy one elsewhere and fit it myself. Its only Apple saying its not user serviceable as oppposed to it not being possible someone with reasonable ability to fit it themselves.

So I have 2 questions:-

1. does anyone know where I can buy one?
2. is it one item BT+AP or its two seperate items?

I don't really need the Airport part, I just want BT so I can use a BT mighty mouse. And I don't want to waste a USB port on a BT dongle.

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